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WATCH: Giant rotating ice disk forms in US river

A curious formation that has grabbed the attention of Greater Portland, Maine, is actually a spinning ice disk, and it's roughly 91 metres wide. The formation in the Presumpscot River was widely shared on social media, and it has drawn comparisons to an alien spacecraft, a carousel and the moon.

Rob Mitchell, who owns a nearby office building, spotted the alien-looking disk on Monday morning and immediately notified the city of Westbrook, just outside Portland. Officials say the disk is spinning slowly counter-clockwise, and has served as a big raft for ducks and other birds.